Many attempts were made to secure wireless ad hoc networks, but due to special ad-hoc nature, which is lack of a fixed infrastructure and central management, finding an optimal and comprehensive security solution is still a research challenge. Intrusion detection system is one of key techniques and best solution instead of intrusion protection behind protecting a network against intruders on mobile ad hoc network. In this paper, we introduce background knowledge of mobile ad hoc networks as well as intrusion detection systems and mobile agents. After investigating of existing intrusion detection based on mobile agents for wireless mobile ad hoc network; based on our best knowledge from previous researches, we design cluster-based distributed hierarchical intrusion detection system using mobile agents over Cluster-Based Routing Protocol (CBRP). The unique features of CBRP are the main factors of our success in achieving our goal to propose some enhancement based on the characteristics and measure the efficiency of intrusion detection system in term of bandwidth utilization and energy consumption.

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